Windows 8.1 PC doesn't wake up from sleep mode?

[AstroBenny]

I have recently built a new pc (for a friend) and he is having trouble with the sleep states. When the pc is put into sleep state the power button LED flashes, if the power button is pressed then the pc sometimes turns on, other times it doesn't respond and he has to turn the mains off, then back on and then the pc will turn on from an off - mode. Nothing ever happens if the mouse and keyboard are moved or pressed. I think this could be fixed by going into the BIOS but am not sure what settings he should change. The motherboard is a MSI 970 chipset gaming am3+ socket board.

[ProKoN]

go into the bios and press F6 to load optimized defaults

 

then

 

make sure these options are enabled

 

Resume From S3 by USB Device [Disabled]

Disables or enables the system wake up by USB devices.

[Enabled]

Enables the system to be awakened from S3 (Suspend to RAM)

sleep state when activity of USB device is detected.

[Disabled]

Disables this function.

▶

Resume From S3/S4/S5 by PS/2 Mouse [Disabled]

Disables or enables the system wake up by PS/2 mouse.

[Enabled]

Enables the system to be awakened from S3/ S4/ S5 state when

activity of PS/2 mouse is detected.

[Disabled]

Disables this function.